Apparatus for the determination of surface properties

Abstract

A device for determining properties of surfaces having at least one first radiation device having at least one radiation source emitting radiation, having at least one first radiation detector having a first radiation detector element which captures at least a portion of the radiation emitted from the radiation device and subsequently diffused and / or reflected off a measuring surface and emits at least one measuring signal characteristic of the reflected / diffused radiation, and at least one second radiation detector having a second radiation detector element capturing a portion of the radiation from the radiation device and diffused / reflected off a measuring surface and outputs a measuring signal characteristic of the reflected and / or diffused radiation, and at least one filter device which is placeable both in the optical path between the radiation device and the first radiation detector and in the optical path between the radiation device and the second radiation detector.

Description

BACKGROUND[0001]The present invention relates to a device for determining the properties of surfaces.[0002]The optical impression of objects or their surfaces, in particular the surfaces of motor vehicles, is decisively determined by their surface properties. Since the capability of the human eye to objectively evaluate surface properties is limited, there is a need of auxiliaries and equipment for qualitatively and quantitatively determining the properties of surfaces.[0003]The properties of surfaces determined are for example gloss, orange peel, color, macro- and / or micro texture, distinctness of image, haze, surface texture and / or topography, and the like.[0004]Devices are known from the prior art in which a radiation means projects radiation onto the examined measuring surface and the radiation reflected and / or diffused off said measuring surface is captured and evaluated by a detector. Many applications require or prefer that an examination of the reflected radiation includes t...

AI Technical Summary

Benefits of technology

[0008]It is therefore an object of the present invention to provide a device for determining surface properties which keeps the costs for the filters and thus the overall costs low. Also, the precision of the corresponding devices is intended to be improved.

[0015]Using standard light and in particular using the reference light type D65 will enhance the determination of easily comparable surface variables. The reference light type D65 is representative of a phase of natural daylight at the color temperature of 6500 Kelvin. The, precise theoretical emission spectrum of D65 standard light is preferably approximated by means of xenon lamps.

[0022]In this way one set of filters can simultaneously be used for filtering in all of the radiation detector elements, which is thus a particularly efficient configuration of the device of the invention.

[0023]In another preferred embodiment the plurality of filter means is positioned on a shared carrier means. In this way it can be ensured that the individual filter means are guided in a predefined way into the respective optical paths between the radiation means and the individual radiation detector elements. A carrier means is understood to mean any means suitable to position the individual filter means in predefined configurations or in particular to guide them relative to the optical paths.

[0037]Another preferred embodiment provides that at a specified moment, filter means having different optical properties can be placed in the optical paths between at least two radiation means and the radiation detector element. This allows to simultaneously evaluate different spectral radiation components at different locations and thus at different angles.

Problems solved by technology

However, reference is made to the fact that all the objects are not necessarily achieved to the same extent by all the objects of all the subclaims.

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